Any changes in breathing should be concerning, you should keep a close eye on Lucy to see if it passes; if it seems like she is having difficulty getting enough oxygen or her gums are pale you should visit a Veterinarian immediately. Infections, laryngeal disorders, airway obstructions, tumours, poisoning, anaemia among other causes may cause respiratory difficulties. Regards Dr Callum Turner DVM

If your cat is suffering from shock or pain as a result of trauma, if no broken bones are detected your vet will often take a conservative approach and allow your cat to be released to go home with a prescription for pain medication. You will need to provide a safe, warm and quiet place for your cat to heal and recover. Allergies will be treated with antihistamines and ongoing medication dosage in the case of seasonal or non acute reactions. 
Tabbies: Tabby cats constitute the oldest and most common pattern seen and are one of the most popular. They are easily differentiated by their stripes, whorls, and spots ( the latter generally found on their tummies). Striped tabbies are often referred to as "tiger," for obvious reasons. They are also known as "mackerel tabbies." The round bulls-eye marking on the sides of a tabby identifies it as a "classic" tabby. While spotted tabbies sometimes crop up in "barn cats," they are also found in breeds, such as the Ocicat and the American Bobtail. Tabbies may also wear white "accessories," such as a bib, vest, or "boots." Thus, they could be described as "tabby with white."
Cats can also develop fluid build up in the chest that is localized outside the lungs. This happens in an area named the pleural space. When fluid accumulates in the pleural space, the lungs cannot inflate as much as they should. Your cat will develop shortness of breath and labored breathing as more fluid fills this space. According to VCA Animal Hospitals, some causes of pleural effusion include:

This breed does not like change, preferring for things to be uniform and predictable. It can be thrown off when dinnertime is altered, and is nit-picky about hygiene. It will not even enter its litter box if it is dirty. In the early years, this breed developed a reputation at shows for being difficult to work with because of traits like these. The Russian Blue was gentle and happy at home, but at shows it was visibly discontent and temperamental. Popularity declined and fewer Russian Blues were being shown until breeders focused on improving the attitudes of the breed through selective breeding and behavior management (e.g., soft music, recording of show noises, crystals, herbal remedies). This commitment to the breed paid off, and today the Russian Blue is a happy participant at cat shows.
Los Angeles cat breeder Judy Sugden has been working since the late eighties to breed a house cat that resembles a tiger. The result is the Toyger, a registered breed that has a lineage beginning with domestic shorthairs and Bengals selected for their markings. Toygers are now available from breeders all over the world. The breed is still in development, and TICA now has the toyger classified as a championship breed. 
Sorry to hear your kitty is scratching like that! Does he show any signs of skin infections, fleas, mites, wounds from other cats? The cone could have stressed him further, yes, if he was scratching already because of tension/anxiety. Open sores can get infected, especially when left untreated and scratched further. We would recommend taking your kitty to the vet for a diagnosis. They will be able to provide you the advice and medication your kitty might need. Best wishes!
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